package com.heima.app.gateway.filter;

import com.heima.app.gateway.util.AppJwtUtil;
import io.jsonwebtoken.Claims;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

public class AuthorizerFilter implements Ordered, GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1. 获取request和response
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        //2. 判断是否是登录
        if(request.getURI().getPath().contains("/login")){
            //2.1 是登录，放行
            return chain.filter(exchange);
        }

        //3. 获取token
        String token = request.getHeaders().getFirst("token");

        //4. 判断token是否存在
        if(StringUtils.isBlank(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return  response.setComplete();
        }

        //5. 判断token是否有效

        try {

            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            int result = AppJwtUtil.verifyToken(claimsBody);
            if(result == 1 || result == 2){
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return  response.setComplete();
            }

        } catch (Exception e){
            e.printStackTrace();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return  response.setComplete();
        }

        //6. 放行
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
